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Extract the logic for inserting a subvector into a vector alloca.

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No functionality changed. Another step of refactoring toward solving
PR14487.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170300 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-12-17 04:07:35 +00:00
parent 225d25de49
commit d6e4397a5b
1 changed files with 49 additions and 37 deletions
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86
lib/Transforms/Scalar/SROA.cpp
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@ -2506,6 +2506,52 @@ private:
return !LI.isVolatile() && !IsPtrAdjusted;
}
Value *insertVector(IRBuilder<> &IRB, Value *V,
unsigned BeginIndex, unsigned EndIndex) {
assert(VecTy && "Can only insert a vector into a vector alloca");
unsigned NumElements = EndIndex - BeginIndex;
assert(NumElements <= VecTy->getNumElements() && "Too many elements!");
if (NumElements == VecTy->getNumElements())
return convertValue(TD, IRB, V, VecTy);
LoadInst *LI = IRB.CreateAlignedLoad(&NewAI, NewAI.getAlignment(),
getName(".load"));
if (NumElements == 1) {
V = IRB.CreateInsertElement(LI, V, IRB.getInt32(BeginIndex),
getName(".insert"));
DEBUG(dbgs() << " insert: " << *V << "\n");
return V;
}
// When inserting a smaller vector into the larger to store, we first
// use a shuffle vector to widen it with undef elements, and then
// a second shuffle vector to select between the loaded vector and the
// incoming vector.
SmallVector<Constant*, 8> Mask;
Mask.reserve(VecTy->getNumElements());
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
if (i >= BeginIndex && i < EndIndex)
Mask.push_back(IRB.getInt32(i - BeginIndex));
else
Mask.push_back(UndefValue::get(IRB.getInt32Ty()));
V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
ConstantVector::get(Mask),
getName(".expand"));
DEBUG(dbgs() << " shuffle1: " << *V << "\n");
Mask.clear();
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
if (i >= BeginIndex && i < EndIndex)
Mask.push_back(IRB.getInt32(i));
else
Mask.push_back(IRB.getInt32(i + VecTy->getNumElements()));
V = IRB.CreateShuffleVector(V, LI, ConstantVector::get(Mask),
getName("insert"));
DEBUG(dbgs() << " shuffle2: " << *V << "\n");
return V;
}
bool rewriteVectorizedStoreInst(IRBuilder<> &IRB, Value *V,
StoreInst &SI, Value *OldOp) {
unsigned BeginIndex = getIndex(BeginOffset);
@ -2518,44 +2564,10 @@ private:
: VectorType::get(ElementTy, NumElements);
if (V->getType() != PartitionTy)
V = convertValue(TD, IRB, V, PartitionTy);
if (NumElements < VecTy->getNumElements()) {
// We need to mix in the existing elements.
LoadInst *LI = IRB.CreateAlignedLoad(&NewAI, NewAI.getAlignment(),
getName(".load"));
if (NumElements == 1) {
V = IRB.CreateInsertElement(LI, V, IRB.getInt32(BeginIndex),
getName(".insert"));
DEBUG(dbgs() << " insert: " << *V << "\n");
} else {
// When inserting a smaller vector into the larger to store, we first
// use a shuffle vector to widen it with undef elements, and then
// a second shuffle vector to select between the loaded vector and the
// incoming vector.
SmallVector<Constant*, 8> Mask;
Mask.reserve(VecTy->getNumElements());
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
if (i >= BeginIndex && i < EndIndex)
Mask.push_back(IRB.getInt32(i - BeginIndex));
else
Mask.push_back(UndefValue::get(IRB.getInt32Ty()));
V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
ConstantVector::get(Mask),
getName(".expand"));
DEBUG(dbgs() << " shuffle1: " << *V << "\n");
Mask.clear();
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
if (i >= BeginIndex && i < EndIndex)
Mask.push_back(IRB.getInt32(i));
else
Mask.push_back(IRB.getInt32(i + VecTy->getNumElements()));
V = IRB.CreateShuffleVector(V, LI, ConstantVector::get(Mask),
getName("insert"));
DEBUG(dbgs() << " shuffle2: " << *V << "\n");
}
} else {
V = convertValue(TD, IRB, V, VecTy);
}
// Mix in the existing elements.
V = insertVector(IRB, V, BeginIndex, EndIndex);
StoreInst *Store = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment());
Pass.DeadInsts.insert(&SI);